FSRbonfbound

FSRbonfbound computes Bonferroni bounds for each step of the search (in linear regression)

Syntax

  • Bbound=FSRbonfbound(n,p)example
  • Bbound=FSRbonfbound(n,p,Name,Value)example

Description

example

Bbound =FSRbonfbound(n, p) mdr with Bonferroni envelopes.

example

Bbound =FSRbonfbound(n, p, Name, Value) mdr with personalized Bonferroni envelopes.

Examples

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  • mdr with Bonferroni envelopes.
  • Example of creation of 1, 50 and 99 per cent envelopes based on 1000 observations and 5 explanatory variables using exact method

    MDRenv = FSRenvmdr(1000,5,'init',10);
    Bbound = FSRbonfbound(1000,5,'init',10);
    plot(MDRenv(:,1),MDRenv(:,2:end),Bbound(:,1),Bbound(:,2:end));
    Click here for the graphical output of this example (link to Ro.S.A. website). Graphical output could not be included in the installation file because toolboxes cannot be greater than 20MB. To load locally the image files, download zip file http://rosa.unipr.it/fsda/images.zip and unzip it to <tt>(docroot)/FSDA/images</tt> or simply run routine <tt>downloadGraphicalOutput.m</tt>

  • mdr with personalized Bonferroni envelopes.
  • Example of creation of 1, 50, 99 and 99.9 per cent envelopes based on 1000 observations and 5 explanatory variables using exact method

    MDRenv = FSRenvmdr(1000,5,'init',10,'prob',[0.01 0.5 0.99 0.999]);
    Bbound = FSRbonfbound(1000,5,'init',10,'prob',[0.01 0.5 0.99 0.999]);
    plot(MDRenv(:,1),MDRenv(:,2:5),Bbound(:,1),Bbound(:,2:5));

    Input Arguments

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    n — number of observations. Scalar.

    Number of observations on which the envelopes are based.

    Data Types: single| double

    p — number of explanatory variables (including the intercept if present). Scalar.

    Number of expl. variables on which the envelopes are based.

    Data Types: single| double

    Name-Value Pair Arguments

    Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside single quotes (' '). You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

    Example: 'init',100 starts monitoring from step m=100 , 'prob',[0.01 0.99]

    init —Search initialization.scalar.

    It specifies the point where to initialize the search and start monitoring minimum deletion residual. if init is not specified it will be set equal to :

    p+1, if the sample size is smaller than 40;

    min(3*p+1,floor(0.5*(n+p+1))), otherwise.

    Example: 'init',100 starts monitoring from step m=100

    Data Types: double

    prob —quantiles for which envelopes have to be computed.vector.

    1 x k vector containing quantiles for which envelopes have to be computed. The default is to produce 1%, 50% and 99% envelopes.

    Example: 'prob',[0.01 0.99]

    Data Types: double

    Output Arguments

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    Bbound —Bonferroni forward envelopes of mdr. Matrix

    Matrix with n-m0+1 rows and length(prob)+1 columns:

    1st col = fwd search index from m0 to n-1, 2nd col = bound for quantile prob[1], 3rd col = bound for quantile prob[2], ..., (k+1) col = bound for quantile prob[k].

    References

    Atkinson, A.C. and Riani, M. (2006), Distribution theory and simulations for tests of outliers in regression, "Journal of Computational and Graphical Statistics", Vol. 15, pp. 460-476.

    Riani, M. and Atkinson, A.C. (2007), Fast calibrations of the forward search for testing multiple outliers in regression, "Advances in Data Analysis and Classification", Vol. 1, pp. 123-141.

    See Also

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